The solution is to push a pointer to the temporary structure onto GCStack so that it will be marked during garbage collection. Now, if the corruption only occurs after a garbage collection it's probably due to an unprotected temporary structure. To debug this situation, turn off the call to gc() in repl(), by commenting out the line: gc(NULL, env) Īlso, turn on the printing of garbage collections, by uncommenting: #define printgcs These dangling pointers are unprotected and undocumented, and the source of. special and function forms exist, a macroexpander must remove macro calls by. Pure LISP excludes most of the programming ideas which lead to poor code. For example, if your extension to uLisp is constructing a list, it's important to make sure that it doesn't get garbage collected while it is being constructed. In fact, the SLY Common Lisp IDE11, a derivative program of. Unpredictable corruptions are often the result of garbage collection having an effect on temporary Lisp structures. For example, to print the Lisp object arg to the serial output you can add a statement such as: printobject(arg, pserial) Debugging the effect of garbage collections program execution but may differ between program executions. When writing your own extensions to uLisp it's useful to be able to print out Lisp objects at different points in the code. Arbitrary-precision arithmetic extension.
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